Guide and feed device on sewing machines



Sept. 8, 1936. MQSTER 2,053,572

GUIDE AND FEED DEVICE ON SEWING MACHINES Filed April 5, 1934 Patented Sept. 8, 1936 UNiTED STATES GUIDE AND FEED DEVICE 0N SEWING-- MACHINES Fritz Moster, Pirmasens/Itheinpfalz, Germany Application April 5, 1934, Serial no. 719,067 In Germany April 6, 1933 5 Claims. (01. 112--20 7) The invention relates to a guide and-feed device on sewing machines for marginal sewing operations of all kinds, e. g. for hemming, binding, piping, and machines for securing welts to boots and shoes.

The arrangement is particularly adapted for attachment to shoe making machines for handling welts with an upturned lip.

The arrangement is essentially characterized by an arrangement-of a slide member immediately laterally of the needle or other securing device, said slide member engaging and advancing the edge of the work by means of a clamping lever and an oppositely disposed yoke. Further, immediately in front of the said device may be provided a guide adapted to the profile of the work to be handled. The clamping lever is preferably toothed on its underside which engages the work and is associate-d with means urging it against the work. This means may consist of an appropriately disposed spring. According to a further embodiment, the lever can be constructed as a single armed bell-crank lever, the angularly bent portion of which is connected with the driving linkage controlling the motion of the slide member in such manner that at the commencement of the feed motion the clamping lever is urge-d against the welt and is lifted therefrom during the return motion.

Two forms of the invention embodied in a machine for sewing welts to boots and shoes are shown by way of example in the attached drawing, in which Fig. 1 shows a side View of the guide and feed device with spring urged lever,

Fig. 2 shows a front view in which the sewing of a welt to the upper and inner sole is indicated,

Fig. 3 shows a bottom view,

Fig. 4 shows a top view,

Fig. 5 shows a modified construction in which the clamping lever is controlled from the driving linkage.

As is apparent from the drawing the welt I) passed beneath the presser a is advanced in the usual manner in sewing machines by the reciprocation of the slide member d guided in a lateral lug c of the presser, in that the clamping lever f pivotally mounted on the slide member 01 under the action of a spring 6 and provided with an oblique toothing on its underside, urges the welt against the yoke-shaped end g and moves it forwardly. The reciprocation of the slide member (I with its guide bar it is effected in known manner by eccentrics, cam discs or the like. On the return motion of the slide member the toothed clamping lever ,f in consequence of its resilient mounting, simply slides over the upper edge of the welt.

For securing welts with an upturned lip a specially constructed guide 2' is provided on the underside of the presser a. This guide is shaped in accordance with the profile of the welt and has a forwardly extended tongue is which completely pushes back theprojecting edge of the welt. As this g'uideis directly in front of the feed device and on its emergence from the guide the projecting lip is directed obliquely outwardly, the projecting lip is prevented from folding over at the stitching point, slipping under the upper and being sewn thereto. On the other hand however the projecting lip lies snugly against the upper I so that a perfect attachment of the welt results. The guide 1' with the tongue k is advantageously disposed at a suitable acute angle to the direction of feed of the slide member d.

A reliable and constant guidance of the welt with respect to the upper l is attained in that the lower end 9 of the slide member d is constructed in the form of a yoke so as to form a support for the welt b and simultaneously to urge the projecting lip against the upper l which itself is guided along the horn m disposed in its interior and containing the thread. In this way the yokeshaped end 9 of the slide member constitutes the abutment for the clamping lever f and ensures a reliable and uniform attachment of the welt to the shoe. It is thus'assured that at the junction of the two ends of the welt the seams precisely coincide.

In the construction according to Fig. 5 the clamping lever has an upwardly bent extension 0 so that it forms a bell-crank lever one end of which is pivoted to the slide member d whereas the other end is engaged by the driving link :0. As soon as the driving device comes into operation, the link 10 pulls on the free end of the arm 0 whereby the lever is in the first place rotated on its pivot and urged against the back of the work. Then the slide member 01 is drawn forwardly together with the clamped welt. On the return motion of the linkage the clamping lever is in the first place lifted from the welt and then the slide member (1 displaced. The clamping and feed device thus operates positively and does not depend on the action of a spring such as is employed in the first embodiment.

The devices shown afford the advantage in comparison with the known sewing and riveting machines for boots and shoes that the guide for the work is open on the side facing the operator.

The operator can therefore place the shoe on the horn more readily and supervise the work better.

The invention is not limited to the examples shown; it can on the other hand be applied with advantage in all kinds of sewing machines in which marginal sewing operations have to be performed. Naturally the guide has to be adapted to the profile oi the work which is to be handled at any particular time.

What I claim is:--

1. In a sewing machine for marginal sewing operations, a guide and feed device comprising a slide member disposed laterally of the sewing means and carrying a yoke shaped portion extending beneath the work, and a clamping lever movably mounted on said slide member for clamping the work against said yoke shaped member.

2. In a sewing machine for marginal sewing operations, a, guide and feed device comprising a slide member disposed laterally of the sewing means with a yoke shaped portion extending beneath the work, a clamping lever for clamping the work against said yoke shaped member, and a guide adapted to the profile of the work and disposed directly in front of said clamping lever and yoke shaped portion.

3. In a sewing machine for marginal sewing operations, a guide and feed device comprising a slide member disposed laterally of the sewing means with a yoke shaped portion extending beneath the work, a clamping lever pivotally mounted on said slide member for clamping the work against said yoke shaped portion, spring means urging said clamping lever into engagement with the work, a presser, and a lateral lug on said presser, wherein said slide member is guided.

4. In a sewing machine for marginal sewing operations, a guide and feed device comprising a slide member disposed laterally of the sewing means with a yoke shaped portion extending beneath the work, a clamping lever for clamping the work against said yoke shaped portion, said clamping lever being constructed in the form of a bell crank lever, the angularly bent limb being hinged to an actuating link from which the motion of the slide member is derived.

5. In a sewing machine for the attachment of welts with an upturned lip, a guide and feed device comprising a slide member disposed laterally of the sewing means with a yoke shaped portion extending beneath the work, a clamping lever for clamping the work against said yoke shaped portion and, a guide disposed directly in front of the clamping lever and yoke shaped portion adapted to the profile of the welt and equipped with a forwardly extending tongue.

FRITZ MOSTER 

